Brake for vehicles



Aug. 19, 1930. T. H. RICHTER BRAKE FOR VEHICLES Filed Sept. 17, 1928 2 Sheets-Sheet Wla' @KKK/PPP na QW ,wie ed, y

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Aug@ wy 1930? T. H. RICHTER BRAKE FOR VEHICLES Filed sept. 17, 1928 2 sheetysheet l Inventor. Thomas Il. Rz/ckez".

26 Hai .OZH eys Patented Aug. 1e, 193e 'mons n. armados Los moms, Gutmann BRAKE lF03 VEiHIGLES 'Application led September 17, 1928. Serial No. 806,450.

This invention relates to an im rovement in a vehicle brake, and the princ1pal object thereof is to providea brake that 1s equally effective in retarding the rotation of a'vehicle wheel such as is necessary in ordinary travel, and also to instantly lock or release the wheel in emergencies.

To that end I provide brake shoes arranged to engage nearly the yentire inner peripheral '10 surface of the brake drums with means for instantly moving the shoes outwardly to engage the drum with a force suited to the occasion; also I rovide pairs of strong springs for eachshoe t at are normally under tension which instantly act to release the shoes when the brake pedal is moved toward idle position.

Another objectI of the invention is to provide a vehicle brake that will not stick after it has been operated to retard or stop the wheel and the brake pedal is moved toward idle 1position to release the brake. To that end provide steel guide rollersfin the guides for the brake plungers that are suiliciently loose in their"sockets to permit them to move slightly when the plungers are moved, thereby avoiding frictional contact of the` plungf ers with the walls of the guides so -that the plunger are not liable to stick in the guides when the brakes are applied. In other words the rollers prevent the rotary force of the brake drum on the shoes vwhen engaged from thrusting the plungers sidewise into the Walls of the guides so as tocause them to stick.

Features of invention are shown in the construction, combination and arrangement of parts whereby a vehicle brake is rovided that is easy toconstruct, assemble an operate and which is eilective and durable in use.

A feature of invention is shownin the novel construction and arrangement of the brake shoes and means for lining them, whereby the lining is held smooth and taut on the surface of the shoes.

Other objects, advantages and features'o invention may appear from the accompany-y ing drawings, the suhgoined detailed description and the appended claims. I

The .accompanying drawings iliustrate the 60 invention.

Fig. 1 is a central sectionthrough a brake drum constructed in accordance with this invention, showln the brake shoes out of engagement with t 111g by dotted lines the e brake drum, and indicatlever link and bell crank for rotating the cam hub. The section is taken on the line l--l of Fig. 2. Fig. 2 is a fragmental section on line 2-2, Fig. 1, with the brake shoes in the same position as shown in Fig. 1.

Fig

. 3 is an end view of a non-rotaryl disk that carries the guides for theplungers and pins for guiding the ends of the brake shoes, showing the parts on a slightly reduced scale.

Fig. 5 is a side view of shoes detached from the on line z1--4, Fig. 3.

one of the bra Fig. 4 is a section brake. Fig. 6 is a diagrammatic plan view of the rear wheels of a vehicle With a pair of my v improved brakes connected thereto, and showinglturn-buckles in the connections between t eir crank arms and the foot brake pedal. Fig. 7 is a view of the cam and its operating means detached from the brak Fig.l

8 is an end view of the cam and olperating means for adjusting onebrake re another.

ative to The vehicle brake includes a metal drum 10 that is secured, to wheel 11, and an axle 12 in an axle housing structed in the usua manner.

13 that can be conway or any desired The foregoin parts are old and well known in the art and or that reason are not shown or described in detail.

The drum 10 is provided with an internalv peripheral braking surface 14 -to be engaged by the lining 15 on the brake that is adapted shoes 16 to retard orl stop the wheel. i The brake shoes 16 are integral with the outer ends of the lungers 17 that extend down throu h gui es 18 that are integral with the dis 19 that is secured to the axle brazing, or by screws 20, 'as indicated 1n Fig. 2. In other. words, this disk is held stationary relative to The inner ends of the the vehicle wheel.

plungers 17 ride on the surfaces of the cams 21 that are integral mounted on the axle inside the drum 10.

vhousing 13 in any well known. way, as by i,

This hub 22 is provided with .an arm 24 that is pivotally connected by a link 25 to a crank 26 that is extended through the disk 19 so that it can be connected by a turn-buckle 27 to the brake rod 28 and foot pedal 29 so that it can be adjusted relative to the other vehicle brake, as shown in Fig. 6.

The arm 24 and its connection to the brake pedal is such that when the pedal is moved in braking direction the cams 21 will force the brake shoes outwardly to engage their brake linings 15 with the drum, and when the arm 24 is moved in the reverse direction the springs 30 will disengage the brakes from the drum. I

There is a. pair of strong springs 30 tor each brake shoe and they are arran ed to disengage the brakes from the drum t e instant the brake cams are -reversely rotated. ln other words these springs are always under tension and normally hold the inner ends ot the plungers 17 engaged with the cams 21. The outer ends of the springs 30 are secured to the ribs 31 of the shoes and their inner ends are hooked over extensions 32 on the guides 18 and they coact with the guides in preventin the brakes from sticking or bindinv' in bra ing position.

In addition to the guides 18 for the plungers 17 I also provide pins v33 for guiding the ends of the shoes. These pins extend through slotted extensions 34 that are integral with the shoes and arranged adjacent their ends. The pins 33 are secured to the disk 19 so they extend through the extensions 34 and coact with the guides 18 in guiding the brake shoes.

Also to insure free and easy movement of the brake shoes both toward and from the brake drum, I provide pairs of steel guide rollers 35 that are arranged to hold the plunger-s out of frictional contact with the Walls of the uides and the rollers are sufliciently loose in their sockets to permit them to rotate slightly Iwhen the plungers are actuated.

Preferably there are four of the brake shoes, and each has a peripheral surface 36 over which the brake linings 15 are stretched and extended over and turned under the ends of the shoes and secured by bolts 37.

The bolts 37 are couiiter-sunk in the rims of the brake shoesiand are secured to the turned under end portions of the brake linings so that only the linings engage the drum at any time.

The contour of the brake shoes is substantially the same curvature as the inside peripheral surface 14 of the brake drum, `so that when the brakes are applied to retard or stop the wheel, the brake linings evenly engage the drum, or in other words the braking contact of the lining with the drum is substantially the same throuvhout.

In operation the arm 24 1s moved by the brake pedal 29 to rotate the hub 22, and thereby move the cams 2l to drive the p lun gers outwardly to engage the brake linings with the drum to retard or stop the wheel; and the brakes are released by reversing the movement of the cams so that the sprin s 30 can act to release the brakes from the rum as described.

The brakes are constructed and arranged so that only a very slight pressure on the brake pedal is necessary to set the brakes suficiently to retard the wheels and a slightly greater pressure on the pedal will stop rotation of the wheels unti the brakes are released; and also the brakes are constructed of relatively heavy material so that they will not easily break in stopping the rotation of the wheels on relatively high speeds.

I claim as my invention:

1. A vehicle brake including a hollow brake drum secured to the wheel of a vehicle having an axle housing, a disk secured to the axle housing that is arranged to close one end of said drum, rectangular hollow guides integral with said disk, pliingers extending through said guides, roller bearings interposed between said plungers and the walls of said guides, brake shoes on the outer ends of said plungers for engaging said drum, slotted extensions adjacent the ends of said shoes, pins in said disk arranged to extend through the slots of said extensions to guide the outer ends of said shoes, cams engaging the inner ends of said plungers vfor moving said shoes outwardly, and a pair of springs adjacent the ends ofisaid shoes that are interposed between each shoe and its respective guide for the purpose specified.

2. A vehicle brake including a hollow drilm secured to the wheel of a vehicle having an axle housing, a disk secured to the axle housing for closing one end ot' said drum, a pluralit of brake shoes movable radially in said f rum, brake linings on said shoes having end portions turned under the ends of said shoes, countersunk bolts in the ends of said shoes arranged to extend through the end portions of'said linings so that only the faces of said linings engage said drums, and means for moving said shoes for the purpose specified.

3. A vehicle brake including a hollow drum secured to a vehicle wheel, a disk closing one end of said drum. guides integral with said disk. plungers sli'dablv mounted in said guides, shoes integral with the outer ends of said plungers, cams for moving said plungers outwardly to engage said shoes with said drum, and steel guide rollers interposed between said plungers and the walls of said guides for the purpose specified.

In witness whereof, I have hereunto aflixed my signature.

THOMAS H. RICHTER. 

